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<td> <div>定义于头文件 <code>&lt;stdatomic.h&gt;</code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c"><span class="co2">#define ATOMIC_BOOL_LOCK_FREE     /* implementation-defined */</span><br>
<p><span class="co2">#define ATOMIC_CHAR_LOCK_FREE     /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_CHAR16_T_LOCK_FREE /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_CHAR32_T_LOCK_FREE /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_WCHAR_T_LOCK_FREE  /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_SHORT_LOCK_FREE    /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_INT_LOCK_FREE      /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_LONG_LOCK_FREE     /* implementation-defined */</span><br>
<span class="co2">#define ATOMIC_LLONG_LOCK_FREE    /* implementation-defined */</span><br>
</p>
<span class="co2">#define ATOMIC_POINTER_LOCK_FREE  /* implementation-defined */</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-c11">(C11 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>展开成求值为 <code>0</code> 或 <code>1</code> 或 <code>2</code> 的<a href="../language/constant_expression.html" title="c/language/constant expression">预处理器常量表达式</a>，它指示对应<a href="../atomic.html" title="c/atomic">原子类型</a>（有符号及无符号一同）的免锁属性。
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td>  值
</td>
<td>  解释
</td></tr>


<tr class="t-dsc">
<td>  <code>0</code>
</td>
<td>  该原子类型决不免锁
</td></tr>

<tr class="t-dsc">
<td>  <code>1</code>
</td>
<td>  该原子类型有时免锁
</td></tr>

<tr class="t-dsc">
<td>  <code>2</code>
</td>
<td>  该原子类型始终免锁
</td></tr>
</table>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 7.17.1/3 atomic lock-free macros (p: 273)
</li></ul>
</dd></dl>
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